A Shih Tzu is one of the cutest and the most popular dogs in the world. Also, it’s one of the smallest dog breeds in the world. Though their exact origin is not known, they are believed to have originated in Tibet, and developed in China. They are alert, outgoing, affectionate, and loyal. Shih Tzu is one of the sweetest breed of dogs that any owner will love to spoil with care and affection.